I'm not a regular contributor so I don't have access to the Trade forums, and if I'm wrong in asking here, may an admin smite me, but I'm wondering if there's any shop online that carries just the cable, or if there's a suitable generic replacement, or whether someone might be interested in selling me their spare, short or long, doesn't matter.

"Mini-USB" seems to be ambiguous, as I believe the connector on the top of the DS-X (which, coincidentally, happens to be the same connector as the ones on the Motorola RAZR, v325 and other phones) is also called a Mini-USB but they're not the same.